/*
 * Copyright 2021 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.gradle.util

import org.gradle.api.internal.provider.MissingValueException
import org.gradle.api.internal.provider.Providers
import spock.lang.Specification

class DeferredUtilTest extends Specification {

    def "unpacks #description to null"() {
        expect:
        DeferredUtil.unpack(value) == null
        DeferredUtil.unpackOrNull(value) == null

        where:
        description | value
        'Callable'  | { -> null }
        'null'      | null
    }

    def "unpackOrNull of #description is null"() {
        expect:
        DeferredUtil.unpackOrNull(value) == null

        where:
        description | value
        'Provider'  | Providers.notDefined()
        'Provider in Callable'      | { -> Providers.notDefined() }
    }

    def "unpack of #description fails"() {
        when:
        DeferredUtil.unpack(value)
        then:
        thrown(MissingValueException)

        where:
        description            | value
        'Provider'             | Providers.notDefined()
        'Provider in Callable' | { -> Providers.notDefined() }
    }
}
